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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen über die Kinetik und den Mechanismus der Bindung von Schwefeldioxid und von Stickoxiden durch gasförmiges Ammoniak. II. Thermodynamische Gleichgewichte im System SO2, NH3, H2O und CO2Die Abhängigkeit der Gleichgewichtskonstanten der Ammoniumsulfitbildung aus SO2, NH3 und H2O von der Temperature, die mit der von Wolfkowitsch und Zirlin theoretisch abgeleiteten Gleichung berechnet wurde, konnte durch Auswertung experimenteller Daten bestätigt werden. SO2 kann im festen Ammoniumsulfit durch CO2 ersetzt werden falls der Partialdruck von CO2 mindestens 104mal größer ist als der Partialdruck von SO2.
    Notes: The temperature dependence of the equilibrium constant of the formation of ammonium sulphite from SO2, NH3, and H2O given by theoretical equation derived by Wolfkowitsch and Zirlin has been confirmed by calculations based on the accessible experimental data. Substitution of SO2 by CO2 in solid ammonium sulphite can take place when partial pressure of CO2 exceeds at least 104 times that of SO2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Kinetics and Mechanism of the Reaction of Sulphur Dioxide and Nitrogen Oxides with Gaseous AmmoniaIt was found that depending on the partial pressure of SO2, H2O, and NH3 different solid products were formed. Formation of the product containing the smallest amount of the substrate of the lowest partial pressure is favoured.The measured stability limits of the solid products confirmed the former thermodynamic calculations. The conditions for effective binding of NOx with ammonia were established.
    Notes: Es wurde festgestellt, daß in Abhängigkeit von den Partialdrucken von SO2, H2O und NH3 in der Gasphase verschiedene feste Produkte gebildet werden. Bevorzugt ist dabei Bildung des Produktes, das möglichst kleine Mengen der im Unterschuß vorhandenen Substanz enthält.Die experimentell ermittelten Grenzwerte der Stabilität fester Substanzen bestätigten die Ergebnisse früher durchgeführter thermodynamischer Berechnungen. Bedingungen, unter welchen die Stickoxide vom Ammoniak am effektivsten gebunden werden, wurden bestimmt.
    Additional Material: 8 Ill.
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  • 3
    ISSN: 1435-1536
    Keywords: Flotation ; adsorption ; carboxylic acid ; amine ; associate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The flotation and adsorption properties of two ionic collectors (n-dodecylamine andn-dodecanoic acid) are compared on the bases of results of mercury flotation in the model flotation apparatus and electrochemical measurements of the double layer capacity. The flotation recovery and the adsorption parameters (standard free enthalpyΔG° A, the interaction coefficient of Frumkin's isotherm, the surface area per molecule) have been determined within the pH range 2.5–12 in solutions of various collector concentrations containing 0.1 N KCl. The maxima of flotation recovery and surface excess have been found at pHs corresponding to pK values for both substances. The influence of the electrolyte on flotation recovery and the gas bubble size distribution dependent upon the pH of the solution is presented forn-dodecanoic acid. The maxima of flotation recovery are involved through the formation of ion-molecule associates (1∶1) as well as an optimum of the bubble size distribution.
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  • 4
    ISSN: 1435-1536
    Keywords: Adsorption ofn-dodecanoic acid ; model mercury flotation ; a. c. polarography ; ion-molecule associate ; attraction constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The systemn-dodecanoic acid/mercury in 0,1 N KCl solutions has been investigated within pH range 4,0–10,5 in order to characterize the adsorption of surfactant and to determine its influence on the flotation of mercury. Flotation tests have been carried out in a model mercury flotation apparatus developed by Pomianowski and Para. Some characteristic parameters of adsorption (attraction constant of Frumkin isotherm, adsorption coefficient at maximum adsorption potential, free standard adsorption enthalpy and area per molecule) have been determined by a. c. polarographic capacity-potential and capacity-time curves. Flotation recovery as well as attraction constant, adsorption coefficient and surface excess reach maximum at pH≈5,1. It is explained by the assumption of an ion-molecule associate formation.
    Type of Medium: Electronic Resource
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